HOW TO TEST SCR WITH DMM? – SELECT DIODE MODE IN DIGITAL MULTIMETER. STEP-1.

Connect positive test lead to cathode Negative test lead to Anode= DMM READING Shows OL or 1 or open.

STEP-2.

Connect Negative test lead to cathode positive test lead to Anode= DMM READING SHOWS OL or 1 or open

positive test lead to Gate = .235V DDM READING = 235 mV. (This Gate voltage is very important) otherwise the short of open.

STEP-3.

Connect positive test lead to cathode

Negative test lead to Anode= DMM READING SHOWS OL or 1 or open

STEP-4.

Connect Negative test lead to cathode positive test lead to Anode= DMM READING SHOWS OL or ‘1’ or open (MEANS

OVER LOAD) the condition is GOOD.

Verification: If you get reading in forward bias as 0000 or OL or 1 or open and in reverse bias as 0000 (or) low values the device can be FAULTY and needs replacement.